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Infiniti G35 (V35) Sedan. Manual - part 545

EC-326

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0462, P0463 FUEL LEVEL SENSOR

P0462, P0463 FUEL LEVEL SENSOR

Description

INFOID:0000000000956701

The fuel level sensor is mounted in the fuel level sensor unit.
The sensor detects a fuel level in the fuel tank and transmits a signal to the “unified meter and A/C amp.”. The
“unified meter and A/C amp.” sends the fuel level sensor signal to the ECM through CAN communication line.
It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output volt-
age changes depending on the movement of the fuel mechanical float.

DTC Logic

INFOID:0000000000956702

DTC DETECTION LOGIC

NOTE:
• If DTC P0462 or P0463 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for

DTC U1000, U1001. Refer to

EC-137, "DTC Logic"

• If DTC P0462 or P0463 is displayed with DTC U1010, first perform the trouble diagnosis for DTC

U1010. Refer to

EC-138, "DTC Logic"

This diagnosis indicates the former, to detect open or short circuit malfunction.

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at ignition
switch ON.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

Turn ignition switch ON and wait at least 5 seconds.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to

EC-326, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000956703

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Refer to

MWI-37, "CONSULT-III Function (METER/M&A)"

Is the inspection result normal?

YES

>> GO TO 2.

>> Go to

MWI-53, "Diagnosis Procedure"

CHECK INTERMITTENT INCIDENT

Refer to

GI-39, "Intermittent Incident"

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0462

Fuel level sensor circuit
low input

An excessively low voltage from the sensor is
sent to ECM.

• Harness or connectors

(The CAN communication line is open or
shorted)

• Harness or connectors

(The sensor circuit is open or shorted)

• Unified meter and A/C amp.
• Fuel level sensor

P0463

Fuel level sensor circuit
high input

An excessively high voltage from the sensor is
sent to ECM.

P0462, P0463 FUEL LEVEL SENSOR

EC-327

< COMPONENT DIAGNOSIS >

[VQ35HR]

>> INSPECTION END

EC-328

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0500 VSS

P0500 VSS

Description

INFOID:0000000000956704

The vehicle speed signal is sent to the “unified meter and A/C amp.” from the “ABS actuator and electric unit
(control unit)” by CAN communication line. The “unified meter and A/C amp.” then sends a signal to the ECM
by CAN communication line.

DTC Logic

INFOID:0000000000956705

DTC DETECTION LOGIC

NOTE:
• If DTC P0500 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC

U1000, U1001. Refer to

EC-137, "DTC Logic"

• If DTC P0500 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer

EC-138, "DTC Logic"

DTC CONFIRMATION PROCEDURE

INSPECTION START

Do you have CONSULT-III?

YES

>> GO TO 2.

>> GO TO 5.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

>> GO TO 3.

CHECK VEHICLE SPEED SENSOR FUNCTION

NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.

With CONSULT-III

Start engine (VDC switch OFF).

Read “VHCL SPEED SE” in “DATA MONITOR” mode with CONSULT-III. The vehicle speed on CON-
SULT-III should exceed 10 km/h (6 MPH) when rotating wheels with suitable gear position.

Is the inspection result normal?

YES

>> GO TO 4.

>> Go to

EC-329, "Diagnosis Procedure"

PERFORM DTC CONFIRMATION PROCEDURE

Select “DATA MONITOR” mode with CONSULT-III.

Warm engine up to normal operating temperature.

Maintain the following conditions for at least 50 consecutive seconds.

CAUTION:

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0500

Vehicle speed sensor

The almost 0 km/h (0 MPH) signal from
vehicle speed sensor is sent to ECM even
when vehicle is being driven.

• Harness or connectors

(The CAN communication line is open or short-
ed)

• Harness or connectors

(The vehicle speed signal circuit is open or
shorted)

• Wheel sensor
• Unified meter and A/C amp.
• ABS actuator and electric unit (control unit)

P0500 VSS

EC-329

< COMPONENT DIAGNOSIS >

[VQ35HR]

Always drive vehicle at a safe speed.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to

EC-329, "Diagnosis Procedure"

>> INSPECTION END

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to

EC-329, "Component Function Check"

Use component function check to check the overall function of the vehicle speed sensor circuit. During this
check, a 1st trip DTC might not be confirmed.

Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-329, "Diagnosis Procedure"

Component Function Check

INFOID:0000000000956706

PERFORM COMPONENT FUNCTION CHECK

With GST

Lift up drive wheels.

Start engine.

Read vehicle speed sensor signal in Service $01 with GST.
The vehicle speed sensor on GST should be able to exceed 10 km/h (6 MPH) when rotating wheels with
suitable gear position.

Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-329, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000000956707

CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”

Refer to

BRC-26, "CONSULT-III Function (ABS)"

Is the inspection result normal?

YES